T cell response to T-dependent antigens requires
A. binding of the T cell to a class II MHC receptor on a macrophage.
B. typically a protein antigen.
C. binding of the T cell to a site on the antigen.
D. interleukin-1 activating the T helper cell.
E. All of the choices are correct.
Answer: E
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A) interferons B) complement proteins C) pyrogens D) histamine
A site where a substrate binds to an enzyme
A) Polarity B) Compound C) Denaturation D) Monosaccharides E) Hydrogen bonds F) Element G) Triglycerides H) Amino acids I) Tertiary structure J) Active site
Answer the following statements true (T) or false (F)
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A) there is a predictable seasonal solar activity cycle. B) the rotation of Earth causes a rhythmic circulation of Earth's atmosphere. C) Earth is closer to the sun in summer and farther away in winter. D) Earth is tilted with respect to the orbit around the sun. E) Earth rotates on it's axis relative to the sun.